Syringe



Sept. 5, 1933. H. BUCKHOUT 1,925,235)

SYRINGE Filed Dec. 30, 1931 IN NTOR aLse L 2311672710141 A TTORNE V Patented Sept. 5, 1933 UNITED STATES PATENT OFFICE Application December 30, 1931 Serial No. 583,952

2 Claims.

This invention relates to improvements in syringes, and has for its principal object the provision of a syringe which is simple in construction, economical to make, and which is capable of substantially continuous operation.

Another object of the invention is the provision of a syringe of this kind having a fountain for an antiseptic or other solution, to which the solution is returned after use, with means for Ifiltering the solution which is returned to the fountain so that it may be used over and over again.

To these and other ends, the invention consists in the construction and arrangement of parts ..Ithat will appear from the following description when read in conjunction with the accompanying drawings, the novel features being pointed out in the claims at the end of the specification.

In the drawing:

Fig. 1 is a front elevation of a syringe constructed according to one embodiment of the invention;

Fig. 2 is a vertical section of the same taken substantially on line 22 of Fig. 1;

" Fig. 3 is a fragmenary view partly in section of the interior of the fountain cover;

Fig. 4 is a fragmentary view illustrating the manner in which the filter cup is mounted in the fountain;

3O 1' Fig. 5 is a sectional detail view of a valve, the section being taken substantially on line 55 of Fig. 1, and

Fig. 6 is an enlarged detail view of a spray nozzle. Referring particularly to the drawing, in which like reference numerals refer to the same part in all views, 1 is a fountain which may be constructed of glass or other suitable material and adapted to contain a quantity of antiseptic or other solution. The fountain is open at its top and may be closed by means of a suitable cover 2 threaded thereon. A suitable gasket 3 may be employed for sealing the joint between the cover and upper edge of the fountain, in a well known "manner.

Secured to the outer side of the cover by soldering or other suitable means is a tubular member 4, closed at one end at 5, and extending diametrically across the cover and having its other end directed downwardly and outwardly therefrom for a purpose presently to be described. The

tubular member 4 is arranged to communicate with the interior of the fountain through one or more openings 6 in the cover 2. Arranged in a central opening in the cover 2 of the fountain and projecting downwardly therein to a point adjacent its bottom is a delivery tube 7, constructed of metal or other suitable material. The tube 7 projects upwardly from the cover into the tubular member 4 and is bent for- 69 wardly therein and extends through itsclosed end 5 and is then curved upwardly and rearwardly, where it is connected with the tubular contracted end of a hand bulb 8.

The hand bulb 8 is of well known form, preferably constructed of suitable resilient material such as rubber, and has an enlarged body portion terminating in restricted tubular portions 9 and 10 at its ends. The forward end 9 of the bulb is connected with the end of the tube '7 by j means of a coupling 12 in which is seated a valve 13 of usual or well known construction and arranged to limit the flow of liquid to a direction from the tube 7 to the bulb 8. The rear end 10 of the bulb is connected with a tube 14 by means of a coupling 15 in which a valve 16 is seated. The valve 16 is also of usual or well known construction and is arranged to limit the flow of liquid to a rearward direction away from the bulb 8 to the tube 14.

The tube 14 is preferably constructed of metal and is curved downwardly and forwardly, and at its end communicates with a discharge chamber 17 provided in a tubular member 18 mounted in the rear end of the tubular member 4. The f 'j member 18 is preferably constructed of metal or material having similar properties, and comprises an outer Wall 19 and an inner wall 21 concentric therewith, said walls 19 and 21 being connected at their ends to form the chamber 17, and the inner wall 21 forms a tube continuous with the tubular member 4, open at the rear end. At its rear end the outer wall 19 is flared outwardly and inwardly into connection with the inner wall 21 to form a nozzle 22, seen 1- in detail in Fig. 6, and which may be provided with a plurality of perforations 23 constructed and arranged in any usual or preferred manner.

A filter cup 24 is mounted on a sleeve 25 which may be split at its lower end to resiliently engage the outer wall of the tube '7 to frictionally retain the cup thereon. The filter cup is mounted on the tube 7 within the fountain and preferably adjacent the inner wall of the cover 2. The filter cup may be constructed of fine wire mesh, as shown, or other suitable material, and has an open top to receive solution discharged from the tubular member 4 though the openings 6, and any solid or semi-solid matter mixed with the solution thus discharged is retained in the filter cup while the liquid portion passes through the fine sieve into the fountain.

Arranged in the cover 2 of the fountain 1 is a valve 26 for controlling the flow of air through an opening therein. The valve 26 may be of usual or well known construction and serves to close the passage against the admission of air to the fountain but permits it to escape therefromwhen its pressure becomes great enough to operate the valve.

Mounted on the tubular member 18 is a stop device 27. This stop device is preferably hollow, of frustro-conical form and open at its ends, the smaller end being arranged to frictionally engage the outer wall 19 of the member 18 on which it is adjustably mounted. Extending through the wall of the stop member 27 is an opening or air duct 28 substantially parallel with an element of the cone, and which discharges from the smaller end of the stop member adjacent the outer wall 19 of the member 18.

The operation briefly described is as follows: A suitable solution is poured into the fountain 1 and the cover arranged thereon. The nozzle may then be inserted a distance limited by the stop member 27. If the bulb be now compressed, the valve 16 is opened and the valve 13 closed, and the air from the bulb is discharged from the nozzle and may escape through the tubular member 4 and valve 26. When the bulb is released, it automatically expands, due to the resiliency of its material, the valves 16 and 26 close and the valve 13 opens, with the result that the solution flows from the fountain to the bulb through the tube '7, causing a reduction of the air pressure in the fountain. When the bulb 8 is again compressed, the valve 13 is closed, the valve 16 opened, and the solution in the bulb discharged from the bulb under pressure to the chamber 17 and forcibly from the nozzle 22, the vent 28 serving to relieve the internal pressure and permit the solution, together with any collected solid ors'emisol-id matter, to flow back to the fountain, due to the reduced 'air pressure therein, through the tubular members 18 and 4 and openings '6, from which it is deposited in the filter cup in which the solid or semisolid matter is retained, while the solution flows back into the fountain. bulb is again compressed, the operation is repeated and the pressure in the fountain may be further reduced to increase the suction through the tubular member 4. It will be noted that whenever the pressure in the fountain becomes greater than atmosphere pressure, it is releasedby the valve 26 so that successive operations of When the' the bulb may operate to return the solution to the fountain with considerable pressure exerted on the bulb 8.

It is sometimes desired to keep the solution in the fountain at a temperature above or below normal atmospheric temperature for a considerable period of time, and for such purpose the fountain may be heat-insulated in any well known manner, if desired,

Although only one embodiment of the invention is shown and described herein, it will be understood that this application is intended to cover such changes or modifications as come within the spirit of the invention or scope of the following claims.

I claim: 1. A syringe comprising a fountain, a delivery tube projecting therein, a return tube communi- "cating with the top of the fountain, an annular chamber surrounding the return tube and having a. discharge nozzle at its end adjacent to the inlet of the return tube, a conductor leading from the delivery tube to said annular chamber, a compressible rubber bulb in the delivery tube for withdrawing liquid from the fountain and discharging it into said annular chamber and through said nozzle, and check valves between said bulb and the fountain and between said bulb and said annular chamber, said return tube within the annular chamber acting to return liquid to the top of the fountain.

2. A syringe comprising a fountain, a cover therefor, a tubular member mounted transversely on the cover, said tubular member and cover having adjacent openings to permit communication between the tubular member and the fountain, a delivery tube extending from a point near the bottom of the fountain upwardly through the cover and tubular member, a return tube communicating with said tubular member, an annular chamber surrounding said return tube and having a nozzle at its outer end adjacent to the inlet of the return tube, a conductor leading from said delivery tube to said annular chamber, a compressible rubber bulb in the delivery tube for withdrawing liquid from the fountain and discharging it into said annular chamber and through said nozzle, and check valves between said bulb and the fountain and between said bulb and said annular chamber, said return tube within the annular chamber acting to return liquid to said tubular member and to the top of the fountain.

HALSEY L. BUCKHOUT. 

